Dieing and stamping machine



Aug. 29, 1961 A. BAUER 2,997,946

DIEING AND STAMPING MACHINE Filed Nov. 12, 1958 2 Sheets-Sheet 1 lm/avran Alf BA E ya A TIDE/Vi) Aug. 29, 1961 A. BAUER DIEING AND STAMPING MACHINE 2 Sheets-Sheet 2 Filed Nov. 12, 1958 FIG. 4

A/fre BA E ATTORNEY 2,997,946 DIEING AND STAMPING MACHINE Alfred Bauer, 39 Rue Daniel-Jeanrich'ard, Le Locle, Switzerland Filed Nov. 12, 1958, Ser. No. 773,201 Claims priority, application Sweden Aug. 15, 1958 6 Claims. (Cl. 1015) The present invention relates to a dieing o-r stamping machine in which the punch is rotatably mounted on a support which is in turn rockably mounted on the frame of the machine and which is subjected to the action of a control device imparting to it an alternating rocking movement, the axis of rotation of the punch and the rocking axis of the support being parallel to each other and at right-angles to the direction of stamping or working direction of the punch.

This invention is characterised in that the punch is rigidly connected to at least one gudgeon whose axis, which is parallel to the axis of rotation of the punch, passes through the working end of the latter, said gudgeon rotating in a connecting arm or rod pivoted to the frame of the machine, and constituting with this connecting rod a control mechanism compelling the punch to take up on the said support a determined angular position varying with the movements of the support, the arrangement being such that the machine simultaneously carries out rolling and vibratory striking of the blank being stamped.

The drawing illustrates, by way of example, an embodiment according to the invention.

FIGURE 1 is an elevational view partially in section of a machine for stamping characters on a blank.

FIGURE 2 is a section along the line IIII of FIGURE 1.

FIGURE 3 is a section of a detail of the machine, on an enlarged scale, and,

FIGURE 4 is a diagram of the diiferent movements carried out by the punch during stamping, illustrating the operation of the machine.

The illustrated machine comprises a fixed frame 1 on which is pivoted, about a pivot 2, a movable frame 3 carrying a punch support 4 in the form of a two-armed lever. This support is mounted on the frame 3 so as to oscillate about a pivot 5 parallel to the shaft 2. A hydraulic jack 6 acts on the frame 3 to produce the stamping pressure.

The movable frame 3 also carries a grooved pulley which is driven by a motor, not shown, through the intermediary of belts which are also not shown, and of which the shaft 8 carries a crank 9. The crank pin 10 of this crank is linked to the oscillating support 4 by a connecting rod or arm 11 articulated at 12 on this support. The latter is thus rockably moved about the pivot 5 during operation of the machine.

The punch support 4 has rotatably mounted thereon a shaft 13 on which is fixed, by means of a wedge 14 and screws 15 (FIGURES 2 and 3), a punch 16 the working end of which is designated by 17. This punch is intended for the stamping or embossing of type-writer characters on workpieces or blanks. The latter are mounted on a turn-table 19 rotating about a vertical spindle 20 enabling the workpieces to be brought successively in a stamping position.

The oscillations of the support 4 about its pin 5 cause the working end 17 of the punch to be moved opposite the workpiece 18, producing a rolling effect. However, whereas in the usual machines the support of the punch carries out a translationary movement, in the present machine the punch support carries out a rotary movement so that the axis 13 of rotation of the punch on the Patented Aug. 29, 1961 support describes a trajectory 21 in the form of an arc of a circle (FIG. 4). The trajectory having a component parallel to the working direction 22 of the punch, there occurs a vibratory striking effect which is superposed on the rolling effect. Experience has shown that these two modes of stampingstriking and rollingby being superposed on one another enable a quality of stamping which vibratory striking alone nor rolling alone can achieve.

In order that the rolling may be perfectly exact, the punch is compelled, by means of a control mechanism hereinafter described, to occupy a determined angular position in relation to the punch support 4 and the work support 19, which position varies with that of the support. This control mechanism comprises two gudgeons 23 (FIGURES 2 and 3) carried by cheeks 24 rigidly connected to the shaft 13 carrying the punch, the axis of the gudgeons passing through the working end 17 of the punch. These gudgeons each rotate in a connecting rod 25 pivoted at 26 on the fixed frame 1 of the machine. The circular trajectory 27 (FIGURE 4) carried out by the axis of the gudgeons 23 during the oscillating movements of the connecting rods 25, passes through the stamping point designated by 28.

FIGURE 4, in which the amplitude of certain displacements (it is to be noted that the amplitude of the oscillations of the support 4 has been exaggerated for the sake of clearness) shows that the shaft 13, and con sequently the punch 16, passes from the position, represented by broken lines, corresponding to the upper dead center of the arm of the support 4 which carries the punch, to the position represented in chain-dotted lines corresponding to the lower dead center of this arm of the support. Between these two extreme positions, the punch occupies the position represented in full lines in which stamping or dieing is carried out.

It is to be noted that from the strictly theoretical point of view the circular trajectory 27 of the axis of the gudgeons 23 should be rectilinear and should coincide with the working direction 22 of the punch. However, the length of the connecting rod 25 is suflicient for this are of circle 27 to closely approach a straight line.

In operation of the machine, a workpiece 118 on which a stamping or dieing function is to be achieved by punch 16 is positioned adjacent the punch. Support 4 is then caused to rock about pivot 5 to move shaft 13 along are 21 to a position above or below the working direction 22 of the punch. Simultaneously, shaft 13 is rotated about its axis by gudgeons 23 and connecting rods or arms 25. The simultaneous pivotal and rotating movement imparted to shaft 13 and punch 16 carried thereby provides for rolling and vibratory striking of the workpiece as the punch passes. through the solid line position thereof illustrated in FIGURE 4, thus dieing or stamping characters on the workpiece or otherwise forming the workpiece.

What I claim is:

1. A work stamping or dieing machine comprising a frame having a work support adapted to sustain a workpiece, a punch support rockingly mounted on the frame, means to impart rocking movement to said punch support, a punch rotatably mounted on said punch support, the axis of rotation of said punch and the axis of rocking of said support being parallel to each other and transverse to the working direction of the punch, at least one gudgeon connected to said punch, the axis of said gudgeon being parallel to the axis of rotation of the punch, and means rotatably supporting said gudgeon and pivotal'ly connecting the gudgeon to said frame, said means constraining said gudgeon and punch to rotate in alternately reversing directions about said axis of rotation of the punch during rocking movements of said punch support and compelling the punch to assume predetermined angular positions relative to said work support, said positions varying with the movement of the punch support, whereby said punch undergoes rolling and vibratory striking of a workpiece on said work support.

2. A work stamping or dieing machine comprising a frame having a work support adapted to sustain a workpiece, a punch support rockingly mounted on the frame, means to impart rocking movement to said punch support, a punch rotatably mounted on said punch support, the axis of rotation of said punch and the axis of rocking of said punch support being parallel to each other, gudgeons connected to the opposite sides of said punch and having a common axis of rotation parallel to the axis of rotation of said punch, and connecting arms disposed on opposite sides of said punch and rotatably supporting the corresponding gudgeon, said connecting arms being pivoted to said frame and said connecting arms and gudgeons constraining said punch to rotate in alternately reversing directions about said axis of rota- .tion of said punch during rocking movements of said punch support and compelling the punch to assume predetermined angular positions relative to said Work support, said positions varying with the movement of the punch support, whereby said punch undergoes rolling and vibratory striking of a workpiece on the work support.

3. A work stamping or dieing machine comprising a fixed frame having a work support adapted to sustain a workpiece, a movable frame connected to said fixed frame and adjustable relative thereto, a punch support rockingly mounted on said movable frame, means to impart rocking movement to said punch support, a punch rotatably mounted on said punch support, the axis of rotation of said punch and the axis of rocking of said punch support being parallel to each other and transverse to the Working direction of the punch, means constraining said punch to rotate in alternately reversing directions about said axis of rotation of the punch during rocking movements of said punch support and compelling the punch to assume predetennined angular positions relative to said work support, said positions varying with the movement of said punch support, whereby said punch undergoes rolling and vibratory striking of a workpiece on the work support, and means to adjust the position of said movable frame relative to said fixed frame to position said punch relative to the work support thus to provide for adjusting striking pressure of the punch on a workpiece on the work support.

4. A work stamping or dieing machine of the character indicated in claim 3, and said means for rotating the punch including, a gudgeon connected to said punch and rotatable about an axis parallel to said axis of rotation of the punch and a connecting arm rotatably supporting said gudgeon and pivoted to said fixed frame.

5. A work stamping or dieing machine of the character indicated in claim 3, and said movable frame being pivotally connected to said fixed frame to pivot about an axis parallel to said axis of rotation of said punch, and said means to adjust the position of said movable frame including a hydraulic jack connected between said fixed and movable frames.

6. A work stamping or dieing machine comprising a frame having a work support adapted to sustain a workpiece, a punch support rockingly mounted on the frame, means to im art rocking movement to said punch support, a punch rotatably mounted on said punch support, the axis of rotation of said punch and the axis of rocking of said support being parallel to each other and transverse to the working direction of the punch, at least one gudgeon connected to said punch, the axis of said gudgeon being parallel to the axis of rotation of the punch, said punch having a working face substantially on the axis of the gudgeon, and means rotatably supporting said gudgeon and pivotally connecting the gudgeon to said frame, said means constraining said gudgeon and punch to rotate in alternately reversing directions about said axis of rotation of the punch during rocking movements of said punch support and compelling the punch to assume predetermined angular positions relative to said Work support, said positions varying with the movement of the punch support, whereby said punch face undergoes rolling and vibratory striking of a workpiece on said work support.

References Cited in the file of this patent UNITED STATES PATENTS 1,139,689 Lyon May 18, 1915 1,841,920 Smith Jan. 19, 1932 2,936,700 Bauer May 17, 1960 FOREIGN PATENTS 16,043 Great Britain Aug. 5, 1899 227,219 Great Britain Jan. 15, 1925 

